A.L. Gelgor - Ph. D. (Eng.), Associate Professor, Department «Radio Engineering and Telecommunication Systems», Peter The Great St.Petersburg Polytechnic University E-mail: a_gelgor@mail.ru A.I. Gorlov - Assistant, Department «Radio Engineering and Telecommunication Systems», Peter The Great St.Petersburg Polytechnic University E-mail: anton.gorlov@yandex.ru Nguyen Van Phe - Post-graduate Student, Department « Radio Engineering and Telecommunication Systems», Peter The Great St.Petersburg Polytechnic University E-mail: nvphe1905@gmail.com

In this paper we propose a modification of spectrally efficient frequency division multiplexing (SEFDM) technique to reduce its energy consumptions. In the proposed technique (called RRC-SEFDM) infinite RRC-pulses are utilized as subcarriers - spectrums. We have also suggested algorithms for SEFDM generation and detection in frequency domain. In our approach, we treat spectrum samples as time-domain samples, and entire SEFDM spectrum as a time-domain faster-than-Nyquist signal. The approach allows a signal detection by the Viterbi algorithm. A transition from sinc to RRC subcarriers - spectrums leads to increase of SEFDM symbol duration in time domain. By simulation, it was shown that the bandwidth and energy consumptions of RRC-SEFDM is significantly lower than the consumptions of sinc-SEFDM. Also, the RRC-SEFDM outperform sinc-SEFDM in energy efficiency if the PAPR value is taken into account.

 

1. Isam˙S., Darwazeh˙I. Simple DSP-IDFT techniques for generating spectrally efficient FDM signals // IEEE IET Int. Symp. Commun. Syst., Netw., Digital Signal Process. 2010. P. 20−24.
2. Isam˙S., Kanaras˙I., Darwazeh˙I. A truncated SVD approach for fixed complexity spectrally efficient FDM receivers // Proc. IEEE Wireless Commun. Netw. Conf. 2011. P. 1584−1589.
3. Isam˙S., Darwazeh˙I. Design and performance assessment of fixed complexity spectrally efficient FDM receivers // Proc. IEEE 73rd Veh. Technol. Conf. 2011. P. 1−5.
4. Xu T., Darwazeh˙I. Spectrally efficient FDM: Spectrum saving technique for 5G - // 1st Int. Conf on 5G for Ubiquitous Connectivity (5GU). 2014. P. 273−278.
5. Xu T., Grammenos˙R.C., Darwazeh˙I. FPGA implementations of real-time detectors for a spectrally efficient FDM system // 20th Int. Conf. on Telecommunications (ICT). 2013 . P. 1−5.
6. Xu T., Darwazeh˙I. Bandwidth Compressed Carrier Aggregation // IEEE Int. Conf. on Communication Workshop (ICCW). 2015. P. 1107−1112.
7. Huang˙J., Sui˙Q., Li Z., Ji F. Experimental Demonstration of 16-QAM DD-SEFDM With Cascaded BPSK Iterative Detection // IEEE Photonics Journal. June 2016. V. 8. № 3.
8. Mazo˙J.E. Faster-than-Nyquist signaling // Bell System Technical Journal. 1975. V. 54. № 8. P. 1451−1462.
9. Liveris˙A.D., Georghiades˙C.N. Exploiting faster-than-Nyquist signaling // IEEE Trans. Comm. 2003. V. 51. № 9. P. 1502−1511.
10. Gorlov A., Gelgor A., Van Phe Nguyen. Root-Raised Cosine versus Optimal Finite Pulses for Faster-than-Nyquist Generation // Internet of Things, Smart Spaces and Next Generation Networks and Systems. Springer International Publishing, 2016. P. 628−640.
11. Gelgor A., Gorlov A., Popov E. Multicomponent signals for bandwidth-efficient single-carrier modulation // IEEE Black Sea Conference on Communications and Networking (BlackSeaCom). 2015. P. 19−23.
12. Gelgor A., Gorlov A., Popov E. On the synthesis of optimal finite pulses for bandwidth and energy efficient single-carrier modulation // Internet of Things, Smart Spaces and Next Generation Networks and Systems. Springer International Publishing. 2015. P. 655−668.
13. Gelgor A.L., Gorlov A.I., Popov E.A. Preodolenie «barera» Najjkvista pri ispolzovanii odnochatsotnykh neortogonalnykh mnogokomponentnykh signalov // Radiotekhnika. 2015. № 1. S. 32−48.